For those people who are fed up with constantly wiping water drops off of their lens when shooting in rainy weather, Tokina has a pretty ingenious solution for you: a hydrophobic "rain dispersion filter."
The filter was created by Tokina in cooperation with Japanese broadcasting corporation NHK, and as you can see from teh demo, any water that is sprayed onto the filter just beads up and rolls right down. It's similar to what you see with hydrophobia coatings like NeverWet, which are often used for industrial purposes.
Even more impressive is the view from the other side of the viewfinder. Althought from the front it looks like the view would still be obscured some, the water that is being sprayed onto the filter hardly shows up at all, and then only for a spilt second before it's gone.
Living in a rainy state, can complicate things. But finding out this filter can keep the water off of your (expensive) lens. Can save you money and time. Going out on those rainy days to maybe capture a unique reflection of the Effiel Tower in a storm can now be more of a possibility.